/*
Copyright 2021 The KodeRover Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package handler

import (
	"fmt"
	"strings"
	"time"

	"github.com/gin-gonic/gin"

	"github.com/koderover/zadig/v2/pkg/microservice/aslan/core/multicluster/service"
	internalhandler "github.com/koderover/zadig/v2/pkg/shared/handler"
	e "github.com/koderover/zadig/v2/pkg/tool/errors"
	"github.com/koderover/zadig/v2/pkg/tool/log"
)

func ListClusters(c *gin.Context) {
	ctx, err := internalhandler.NewContextWithAuthorization(c)
	defer func() { internalhandler.JSONResponse(c, ctx) }()

	if err != nil {
		ctx.Err = fmt.Errorf("authorization Info Generation failed: err %s", err)
		ctx.UnAuthorized = true
		return
	}

	clusters, found := internalhandler.GetResourcesInHeader(c)
	if found && len(clusters) == 0 {
		ctx.Resp = []*service.K8SCluster{}
		return
	}

	projectName := c.Query("projectName")
	// authorization check
	if !ctx.Resources.IsSystemAdmin {
		if projectName == "" {
			// TODO: Authorization leak
			//if !ctx.Resources.SystemActions.ClusterManagement.View {
			//	ctx.UnAuthorized = true
			//	return
			//}
		} else {
			if _, ok := ctx.Resources.ProjectAuthInfo[projectName]; !ok {
				ctx.UnAuthorized = true
				return
			}
		}
	}

	ctx.Resp, ctx.Err = service.ListClusters(clusters, projectName, ctx.Logger)
}

func GetCluster(c *gin.Context) {
	ctx, err := internalhandler.NewContextWithAuthorization(c)
	defer func() { internalhandler.JSONResponse(c, ctx) }()

	if err != nil {
		ctx.Err = fmt.Errorf("authorization Info Generation failed: err %s", err)
		ctx.UnAuthorized = true
		return
	}

	// authorization check
	if !ctx.Resources.IsSystemAdmin {
		if !ctx.Resources.SystemActions.ClusterManagement.View {
			ctx.UnAuthorized = true
			return
		}
	}

	ctx.Resp, ctx.Err = service.GetCluster(c.Param("id"), ctx.Logger)
}

func CreateCluster(c *gin.Context) {
	ctx, err := internalhandler.NewContextWithAuthorization(c)
	defer func() { internalhandler.JSONResponse(c, ctx) }()

	if err != nil {
		ctx.Err = fmt.Errorf("authorization Info Generation failed: err %s", err)
		ctx.UnAuthorized = true
		return
	}

	// authorization check
	if !ctx.Resources.IsSystemAdmin {
		if !ctx.Resources.SystemActions.ClusterManagement.Create {
			ctx.UnAuthorized = true
			return
		}
	}

	args := new(service.K8SCluster)
	if err := c.BindJSON(args); err != nil {
		ctx.Err = e.ErrInvalidParam.AddErr(err)
		return
	}

	if err := args.Clean(); err != nil {
		ctx.Err = e.ErrInvalidParam.AddErr(err)
		return
	}

	args.CreatedAt = time.Now().Unix()
	args.CreatedBy = ctx.UserName
	err = args.Validate()
	if err != nil {
		ctx.Err = err
		return
	}

	ctx.Resp, ctx.Err = service.CreateCluster(args, ctx.Logger)
}

func UpdateCluster(c *gin.Context) {
	ctx, err := internalhandler.NewContextWithAuthorization(c)
	defer func() { internalhandler.JSONResponse(c, ctx) }()

	if err != nil {
		ctx.Err = fmt.Errorf("authorization Info Generation failed: err %s", err)
		ctx.UnAuthorized = true
		return
	}

	// authorization check
	if !ctx.Resources.IsSystemAdmin {
		if !ctx.Resources.SystemActions.ClusterManagement.Edit {
			ctx.UnAuthorized = true
			return
		}
	}

	args := new(service.K8SCluster)
	if err := c.BindJSON(args); err != nil {
		ctx.Err = e.ErrInvalidParam.AddErr(err)
		log.Errorf("Failed to bind data: %s", err)
		return
	}

	if err := args.Clean(); err != nil {
		ctx.Err = e.ErrInvalidParam.AddErr(err)
		log.Errorf("Failed to clean args: %s", err)
		return
	}

	err = args.Validate()
	if err != nil {
		ctx.Err = err
		return
	}

	ctx.Resp, ctx.Err = service.UpdateCluster(c.Param("id"), args, ctx.Logger)
}

func GetDeletionInfo(c *gin.Context) {
	ctx, err := internalhandler.NewContextWithAuthorization(c)
	defer func() { internalhandler.JSONResponse(c, ctx) }()

	if err != nil {
		ctx.Err = fmt.Errorf("authorization Info Generation failed: err %s", err)
		ctx.UnAuthorized = true
		return
	}

	// authorization check
	if !ctx.Resources.IsSystemAdmin {
		if !ctx.Resources.SystemActions.ClusterManagement.Delete {
			ctx.UnAuthorized = true
			return
		}
	}

	ctx.Resp, ctx.Err = service.GetClusterDeletionInfo(c.Param("id"), ctx.Logger)
}

func DeleteCluster(c *gin.Context) {
	ctx, err := internalhandler.NewContextWithAuthorization(c)
	defer func() { internalhandler.JSONResponse(c, ctx) }()

	if err != nil {
		ctx.Err = fmt.Errorf("authorization Info Generation failed: err %s", err)
		ctx.UnAuthorized = true
		return
	}

	// authorization check
	if !ctx.Resources.IsSystemAdmin {
		if !ctx.Resources.SystemActions.ClusterManagement.Delete {
			ctx.UnAuthorized = true
			return
		}
	}

	ctx.Err = service.DeleteCluster(ctx.UserName, c.Param("id"), ctx.Logger)
}

func GetClusterStrategyReferences(c *gin.Context) {
	ctx := internalhandler.NewContext(c)
	defer func() { internalhandler.JSONResponse(c, ctx) }()

	clusterID := c.Param("id")
	if strings.TrimSpace(clusterID) == "" {
		ctx.Err = e.ErrInvalidParam.AddDesc("invalid clusterID")
		return
	}

	ctx.Resp, ctx.Err = service.GetClusterStrategyReferences(clusterID, ctx.Logger)
}

func DisconnectCluster(c *gin.Context) {
	ctx, err := internalhandler.NewContextWithAuthorization(c)
	defer func() { internalhandler.JSONResponse(c, ctx) }()

	if err != nil {
		ctx.Err = fmt.Errorf("authorization Info Generation failed: err %s", err)
		ctx.UnAuthorized = true
		return
	}

	// authorization check
	if !ctx.Resources.IsSystemAdmin {
		if !ctx.Resources.SystemActions.ClusterManagement.Edit {
			ctx.UnAuthorized = true
			return
		}
	}

	ctx.Err = service.DisconnectCluster(ctx.UserName, c.Param("id"), ctx.Logger)
}

func ReconnectCluster(c *gin.Context) {
	ctx, err := internalhandler.NewContextWithAuthorization(c)
	defer func() { internalhandler.JSONResponse(c, ctx) }()

	if err != nil {
		ctx.Err = fmt.Errorf("authorization Info Generation failed: err %s", err)
		ctx.UnAuthorized = true
		return
	}

	// authorization check
	if !ctx.Resources.IsSystemAdmin {
		if !ctx.Resources.SystemActions.ClusterManagement.Edit {
			ctx.UnAuthorized = true
			return
		}
	}

	ctx.Err = service.ReconnectCluster(ctx.UserName, c.Param("id"), ctx.Logger)
}

func ClusterConnectFromAgent(c *gin.Context) {
	c.Request.URL.Path = strings.TrimPrefix(c.Request.URL.Path, "/api/hub")
	service.ProxyAgent(c.Writer, c.Request)
	c.Abort()
}

func GetClusterYaml(hubURI string) func(*gin.Context) {
	return func(c *gin.Context) {
		ctx := internalhandler.NewContext(c)
		defer func() {
			if ctx.Err != nil {
				c.JSON(e.ErrorMessage(ctx.Err))
				c.Abort()
				return
			}
		}()

		yaml, err := service.GetYaml(
			c.Param("id"),
			hubURI,
			strings.HasPrefix(c.Query("type"), "deploy"),
			ctx.Logger,
		)

		if err != nil {
			ctx.Err = e.ErrInvalidParam.AddErr(err)
			return
		}

		c.Data(200, "text/plain", yaml)
		c.Abort()
	}
}

func UpgradeAgent(c *gin.Context) {
	ctx, err := internalhandler.NewContextWithAuthorization(c)
	defer func() { internalhandler.JSONResponse(c, ctx) }()

	if err != nil {
		ctx.Err = fmt.Errorf("authorization Info Generation failed: err %s", err)
		ctx.UnAuthorized = true
		return
	}

	// authorization check
	if !ctx.Resources.IsSystemAdmin {
		if !ctx.Resources.SystemActions.ClusterManagement.Edit {
			ctx.UnAuthorized = true
			return
		}
	}

	ctx.Err = service.UpgradeAgent(c.Param("id"), ctx.Logger)
}

func CheckEphemeralContainers(c *gin.Context) {
	ctx := internalhandler.NewContext(c)
	defer func() { internalhandler.JSONResponse(c, ctx) }()

	ctx.Resp, ctx.Err = service.CheckEphemeralContainers(c, c.Query("projectName"), c.Query("envName"))
}
